Thulium doped terbium sensitised CW fluoride fibre laser operating on the 1.47 μm transition

Abstract

Results are presented, for the first time, regarding the spectroscopy and the laser performance of a fluorozirconate fibre codoped with thulium and terbium (0.1% : 1%). This doping scheme relies on concentration induced cross-relaxation effects to relieve population bottlenecked in Tm ³H₄ to Tb ⁷F₀. A minimum threshold of 5.5 mW and a maximum slope efficiency of 16% with respect to launched pump power has been observed for operation on the 1.47 μm transition.